泛型

实战

• 原生的Reduce方法

function customReduce<T, U>(array: T[], callback: (accumulator: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue: U): U {
    let accumulator: U = initialValue;

    for (let i = 0; i < array.length; i++) {
        accumulator = callback(accumulator, array[i], i, array);
    }

    return accumulator;
}

// 示例用法
const numbers = [1, 2, 3, 4, 5];

const sum = customReduce(numbers, (acc, curr) => acc + curr, 0);
console.log(sum); // 输出: 15

const product = customReduce(numbers, (acc, curr) => acc * curr, 1);
console.log(product); // 输出: 120